Independent Electricity System Operator

The Independent Electricity System Operator (IESO) works at the heart of Ontario's power system – ensuring there is enough power to meet the province's energy needs in real time while also planning and securing energy for the future. It does this by:

 

  • - balancing the supply of and demand for electricity in Ontario and directing its flow across the province's transmission lines
  • - planning for the province's medium- and long-term energy needs and securing clean sources of supply to meet those needs 
  • - overseeing the electricity wholesale market where the market price of electricity is set
  • - fostering the development of a conservation culture in the province through programs such as saveONenergy

 

The IESO is a not-for-profit corporate entity established in 1998 by the Electricity Act of Ontario. It is governed by an independent Board of Directors, appointed by the Government of Ontario. Its fees and licences to operate are set by the Ontario Energy Board and it operates independently of all other participants in the electricity market.

 

Through amendments to the Electricity Act, the operations of the IESO and the Ontario Power Authority (OPA) were merged on January 1, 2015, bringing together real-time operations of the grid with long-term planning, procurement and conservation efforts.

Locations:
Toronto, Ontario | http://www.ieso.ca
Contact Information:
Media Desk

Tel: 416-506-2823
Tel: media@ieso.ca

Latest

Oct 10, 2019, 11:21 ET New study shows energy cost savings potential for Ontario greenhouses

TORONTO, Oct. 10, 2019 /CNW/ - Ontario's greenhouse sector is growing fast, and a new report by the Independent Electricity System Operator (IESO) shows there is great potential for energy efficiency ...


Aug 29, 2019, 10:05 ET IESO Demonstration Project to Test Ontario's First Local Electricity Market

TORONTO, Aug. 29, 2019 /CNW/ - The Independent Electricity System Operator (IESO) is launching Ontario's first ever local electricity market in York Region, with support from Alectra Utilities and...


Jul 17, 2019, 09:59 ET IESO to Conduct Routine Voltage Reduction Test

TORONTO, July 17, 2019 /CNW/ - The Independent Electricity System Operator (IESO) will conduct a routine voltage reduction test on Thursday, July 18, 2019, as part of mandatory testing of its...


Jun 20, 2019, 16:07 ET Ontario's Power System is Ready for Upcoming Summer Months

TORONTO, June 20, 2019 /CNW/ - Ontario's power system is prepared to meet the province's expected demand for electricity over the coming summer months, according to the Independent Electricity System ...


Jun 13, 2019, 08:49 ET New Transmission Line to Meet Growing Electricity Needs in Southwestern Ontario

TORONTO, June 13, 2019 /CNW/ - The Independent Electricity System Operator (IESO) has requested Hydro One to develop and construct a transmission line to meet the increasing electricity needs in the...


Mar 25, 2019, 11:55 ET New Electricity Auctions Will Drive Down Costs for Ontario's Consumers

TORONTO, March 25, 2019 /CNW/ - The Independent Electricity System Operator (IESO) is introducing changes to Ontario's electricity system that will help save Ontarians about $3.4 billion over a...


Dec 20, 2018, 13:31 ET New electricity Reliability Outlook says Ontario ready for winter and beyond

TORONTO, Dec. 20, 2018 /CNW/ - Ontario's electricity system has adequate resources to maintain reliability and meet the province's needs over the winter season and beyond, according to a new...


Dec 14, 2018, 15:30 ET IESO Statement on Potential Power Workers' Union Strike at Ontario Power Generation

TORONTO, Dec. 14, 2018 /CNW/ - The IESO ensures the reliable operation of Ontario's electricity grid, the operation of the electricity markets, and coordinates emergency restoration efforts. This...


Oct 24, 2018, 17:18 ET New Transmission Line Will Support Growth in Northwestern Ontario

TORONTO, Oct. 24, 2018 /CNW/ - The Independent Electricity System Operator (IESO) has requested Hydro One Inc. start development work for a new electricity transmission line in northwestern Ontario...


Sep 27, 2018, 12:47 ET New electricity market design will lead to cost-savings for all Ontarians

TORONTO, Sept. 27, 2018 /CNW/ - The Independent Electricity System Operator (IESO) released today its high-level design for a single schedule market (SSM) representing an important milestone in the...


Mar 21, 2018, 16:51 ET Non-carbon emitting resources to provide input as part of IESO plan to renew electricity marketplace

TORONTO, March 21, 2018 /CNW/ - The Independent Electricity System Operator (IESO) released today a Request for Information (RFI) on non-carbon emitting resources (non-emitting resources), as part of ...


Mar 05, 2018, 10:28 ET IESO to Conduct Routine Voltage Reduction Test

TORONTO, March 5, 2018 /CNW/ - The Independent Electricity System Operator (IESO) will conduct a routine voltage reduction test on Tuesday, March 6, 2018, as part of mandatory testing of its...


Dec 15, 2017, 10:08 ET IESO Announces Results of Demand Response Auction

TORONTO, Dec. 15, 2017 /CNW/ - The Independent Electricity System Operator's (IESO) 2017 demand response (DR) auction has resulted in increased consumer participation and lower prices. The auction is ...


Dec 12, 2017, 14:37 ET Ontario's electricity system ready for winter

TORONTO, Dec. 12, 2017 /CNW/ - Ontario's high-voltage power system has adequate generation and transmission resources to maintain reliability and meet the province's forecasted electricity needs over ...


Nov 28, 2017, 11:14 ET Energy Storage Projects Selected to Provide Essential Grid-Balancing Service

TORONTO, Nov. 28, 2017 /CNW/ - Ontario's Independent Electricity System Operator (IESO) announced today that two new energy storage facilities have been selected through a competitive process to help ...


Sep 20, 2017, 13:40 ET IESO Releases Final Round of Contract Offers under Ontario's Feed-in Tariff Program

TORONTO, Sept. 20, 2017 /CNW/ - Ontario's Independent Electricity System Operator (IESO) announced today that it will offer 390 contracts representing about 150 megawatts (MW) of small-scale...


Jun 22, 2017, 14:39 ET Outlook for Ontario's Electricity System Remains Positive over the Next 18 Months

TORONTO, June 22, 2017 /CNW/ -The Independent Electricity System Operator's (IESO) latest outlook for Ontario's power system says the province has enough power to meet the expected demand for...


Apr 20, 2017, 13:30 ET New Leadership to Focus on Reliable System Operations in an Evolving Energy Sector and the Renewal of the Electricity Market

President and CEO, new Board Members appointed to the IESO TORONTO, April 20, 2017 /CNW/ - The Board of Directors of the Independent Electricity System Operator (IESO) has appointed Peter Gregg as...


Jan 19, 2017, 14:13 ET New partnership will support conservation, demand management in Ontario public sector: Innovation in building management at the forefront of IO-IESO agreement

TORONTO, Jan. 19, 2017 /CNW/ - Infrastructure Ontario (IO) and the Independent Electricity System Operator (IESO) have struck a strategic, five-year partnership to test innovative processes,...


Dec 16, 2016, 13:23 ET IESO Announces Results of Demand Response Auction

TORONTO, Dec. 16, 2016 /CNW/ - The Independent Electricity System Operator's (IESO) second annual demand response auction has resulted in both increased participation and prices for demand response...


Dec 15, 2016, 14:35 ET Reliability outlook for Ontario's electricity system to remain positive

TORONTO, Dec. 15, 2016 /CNW/ - The latest report from the Independent Electricity System Operator (IESO) says the outlook for the reliability of Ontario's electricity system will remain positive for...


Oct 25, 2016, 12:24 ET Mark ENERGY STAR® Day in Ontario with Save on Energy

Save on Energy Fall Coupon Event offers discounts on ENERGY STAR® certified products TORONTO, Oct. 25, 2016 /CNW/ - For the first time in Canada, today marks ENERGY STAR® Day, highlighting the value...


Sep 30, 2016, 11:09 ET Find Energy-Saving Ideas this Fall Season at Stores Near You

Save on Energy Fall Coupon Event starts today at participating retailers across Ontario TORONTO, Sept. 30, 2016 /CNW/ - As the warm days of summer give way to cool days and nights, Ontarians can now...


Aug 08, 2016, 11:25 ET IESO to Conduct Routine Voltage Reduction Test Tomorrow

TORONTO, Aug. 8, 2016 /CNW/ - The Independent Electricity System Operator (IESO) will conduct a routine voltage reduction test on Tuesday, August 9, 2016, as part of mandatory testing of its...


Jun 29, 2016, 13:35 ET IESO Expands Role of Renewable Generation in Ontario with Latest Round of Feed-in Tariff (FIT) Contract Offers

TORONTO, June 29, 2016 /CNW/ - Ontario's Independent Electricity System Operator (IESO) today announced it will offer 936 long-term contracts for 241.430 megawatts (MW) of small-scale renewable...